Slice the chicken breast into thick strips and place them in a bowl with the buttermilk to marinate for 10 minutes.
In a shallow dish, whisk together the almond flour, garlic powder, onion powder, smoked paprika, sea salt, and black pepper.
Remove chicken from buttermilk, letting excess drip off, then dredge each piece in the almond flour mixture until fully coated.
Lightly brush or spray the breaded chicken with avocado oil and air-fry at 400°F for 12-14 minutes, flipping halfway through, until golden and crispy.
While the chicken is cooking, prepare the waffle batter by whisking together the oat flour, Greek yogurt, egg white, and baking powder until smooth.
Pour the batter into a preheated waffle iron and cook according to the manufacturer's instructions until the waffle is firm and lightly browned.
Plate the warm waffle, top with the crispy chicken strips, and finish with a drizzle of maple syrup.